Operating bulkhead-doors.



PATENTBD NOV. 6, 1906.

W. L. MERRILL. 7 I OPERATING BULKHEAD DOORS.

APPLICATION FILED JAN. 19. 1906..

2 SHEETS-SHEET I.

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lnvenJCor: Wilbur LgMerr-ill.

PATENTED NOV. 6, 1906.

W. L. MERRILL. OPERATING BULKHEAD DOORS.

APPLIOATION FILED JAN.19. 1,906.

2 SHEETS-SHEET 2.

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wness 2 /64 UNITED STATES PATENT OFFICE.

WILBUR L. MERRILL, OF- SCHENEOTADY, NEW Y i GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

YORK, ASSIGNOR TO .OPERATING BULKHEAD-DOORS.

" I Specification of 7 Application filed January 19,

concern.- "at I, WILBUR' L. MERRILL, a

United States, residing at a y county of Schenectady, State or have invented certain new and Improvements in Operating Bulkheadof-whieh the following is a specification;-

My-m 'rfent on relates to the operation of motors -ter how great theiload, maybe.

"controlled-from a distant point; and its-objectis" to provide'simplemeans for au-v tomatic'ally breakin the motor-circuit when the motor stopped gbyr'an overload, which means winn tmtcrgu tthe supply of current as long asithemot'or is runnin no matcertain casesa s, for instanca in {the operation of -bu1khead-doors ,;-on board ship-it is fre-' quently undesirableto employ overload-circuit breakers in themotor-circuits actuated by the motor-current, since'in case of anemergency it is important that the doors should ,be closed, "even though in closing a .motor may be seriously overloaded by an ob.-

stacle, such as coal, being in the way of the door; but when a motor is actuall stalled and is doing no useful work it shou d be cut out in order to prevent unnecessarily loading the system and possible injury to the motor.

-I shall consequently illustrate and describe my invention as applied to the control of'motors operating bu cad-doors; but it will be understood that my invention is not limited to this articular application, but may be. used in t e control of motors operating other devices, such as valves which may require so much power to start them that ordinary overload devices are out of the question.

. My'invention consists in the combination, with an electric motor and means' controllable at a distance for closing the motor-circuit to start the motor, of means controlled by the speed of the motor for closin the motor-circuitin'dependentl-y of the tant control.

.In other words, when the motor is at rest the closed or not the motor continues in 'op tion until it is stopped load, at which time the distant controlling means operates .to start the motor; but when the motor is up to speed the speed-controlled means comes into play to clos e the motor-circuit independently of the. distant contra means, so that whether the dlstant-control circuit is, hang.

eraby mechanical ovjz speed-controlled evice automatically open: the motor-circuit,

Letters Patent.

My invention further comprises a number of other features, which wil stood by reference to the drawings, in which Figure 1 shows a front elevation of a bulkhead-door operated by an electric motor adapted to be-controlle'd in accordance with my invention. Fig. 2 shows a side elevation of the same with the bulkhead in' cross-section, showing the speed controlled device. Fig. 3 shows a diagram of the circuit connecbest be ,underaccompanying tions. Figz fl shows a modification of the' same, and 1g. 5 shows still afurther modification.

In Figs. 1 and 2, A re resents a water-tight bulkhead rovided wit a vertically-sliding. door B. l he door is raised and lowered b an electric motor M, which carries on its sha t a worm d, engaging a worm-wheel D, which is connected throu h a pinion c with a'rack E on the door B. 'fhe door is thus moved u or down according to the direction of the. motor M. 0 represents a controlling-switch for the motor, rovided with operatmg-ha-ndles onboth sides of the bulkhead, so that a man on either side of the bulkhead may operate the motor to raisefor lower the door. m relpresents an electromagnet the circuit of w ich is controlled from a distant point and which serves to close the motor-circuit to a mechanically to the control ing-switch C, as

lower the door.

This result may be .obtained either by connectin the magnet m indicated in Fig. 2, so as to move the switch to lowering position, or by means of separate [contacts actuated by the magnet, as shown in later figures.

ated by a centrifuge shaft and adapted to assume either of two positions according as the motor is at rest or running.

One arrangement of circuit connections is shown in 'Fig. 3. In this figure, G represents the source-of current for the motor M. The controlling-switch O is shown with centeringsprings c to hold it normally in midosition when not moved by a man at the oor. e re resents the switch at a distant station, w ch is normally held open by a spring;

device on the motorshown. Rfrepresents a resistance ada for comilection in the motor-gircfuif).

.t e magnet m instea 10 sing; nected to the switch 0 controls separate 2%:- taetm The operation of 9 I S represents aswitch actutoo th mw d t gr circuit.

shown in Fig. 2 is as follows: To start the motor from the distant station, the switch 8 is closed and held closed momentarily. A cur rent then passes form one terminal of the generator G through the switch a, through magnet m, a portion of resistance R, and switch C to the other terminal of the generator. Magnet m is consequently energized, drawing up its core and closing a circuit from one generator-terminal through switch C, a portion of resistance R, contacts controlled by meg necessary to hold the switch 8 closed only long.v

enough to allow the motor to start. In its new position switch S closes a circuit, as follows: from one terminal of generator G through switch C, the whole of resistance R, switch S, the motorarmature, switch 0, and the motor-field to the other terminal of generator G. The motor-circuit is thus closed independently of the distant control and will operate until a mechanical overload is placed on the motorsutlicient to stop it, so as to throw the centrifugally-actuated switch to its starting position.

, Since the whole of resistance R is in the motor-circuit when the switch S is in running position the amount of current which the motor draws on being stalled is limited, so as to avoid unnecessarily overloading the system; but at starting only a portion of resistance R is in circuit, so that the motor is enabled to exert a very high torque to overcome the starting friction of the device which it is driving. as the operation of valves which must be moved from their seats and in which the starting friction is very high compared to the running friction and in which the seating torque desired should be lower than starting torque this feature is of considerable importance. In the operation of other devices this feature may be omitted.

Fig. 4 shows a modification of Fig. 3, in which modification the switch S instead of being placed in the motor-circuit is placed in the control-circuit, so that instead of breaking directly the circuit closed by the magnet m it breaks the circuit indirectly by deenergizing the magnet, and similarly it closes the secondcircuit through the motor indirectly by energizing the relay 1-. this niodiiicationgwill be evident from the drawing and requires no further explanation.

In certain casessuch, for instance,

The operation of- Fig. 5 shows a further modification in which the .magnet m a'cts directly on the manual-control switch C instead of on separate contacts When the magnet m is energized by closing switch 8, it pulls the controller G into position to start the motor to lower the door. As soon as the motor starts the switch S breaks the control-circuit, but closes a second circuit through magnet m inde pendent of the distant control. The switch C is thus held in running position until the motor is stalled. H

In the arrangements of both Figs. 3 and 4 the manual movement of switch C cuts the speed-controlled switch out of circuit and enables a man at the door to control the motor independently. both of the speed-controlled switch and of the distant control. In the arrangement of Fig. 5 the switch 0 may. be moved manually whether the magnet m is energized or not. In all three arrangements the door is thus completely under the manual control of aman at the door.

Other modifications of the controlling devices and circuit connections may be employed as desired, and consequently I do not desire to limit myself to the particular construction and arrangement of parts here shown, but aim in the a pended claims to cover all modifications w 'ch are within the scope of my invention.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In combination, an electric motor,

means controllable from a distance for closing the motor-circuit, and means controllable by the speed of said motor for closing said circuit independently of the distant control.

. 2. In combination, an electric motor, means controllable from a distance for'closing the motor-circuit, and a centrifugally-actuated' switch operatively connected to the motor for closing the motor-circuit inde-' pendently of the distant control.

3. In combination, an electric motor, an electromagnet, a switch at a distant point I for controlling said magnet, means actuated by said magnet for closing the motor-circuit, and means controllable by the speed of said motor for controlling the motor-circuit independently of the operation of the distant switch.

4. In combination, an electric motor, anv electromagnet, a switch at a distant point for controlling said magnet, means actuated by said magnet for closing the motor-circuit,

and a centrifugally-actuated switch operatively connected to the motor for controlling the motor-circuit independently of the distant switch. 5. In combination, an electric motor,

means controllable from a distance for starting the motor, and automatic means controlled by the motor 3 eed for maintaining the motor-circuit clos independently of the distant control after the motor has started and for breaking-the motor-circuit when the motoris stopped by an overload.

6. In combination, an electric motor, means controllable from a distance for starting the motor, and a centrifugally-actuated switch operatively connected to the motor and arranged to maintain the motor-circuit closed independently of the distant'control after the motor has started and to break-the motor-circuit when the motor is stopped by an overload.

7. In combination, an electric motor, an electromagnet, a manually-operated switch at a distant point for Gontrollin said magnet arranged to open automatica ly when released, means actuated by said magnet for starting-the motor, and means controlled by the speed of the motorfor'mamtaining the motor-circuit closed after the motor has started independentlyof the distant control.

8. In combination, an electric motor, an eleotromagnet', a manually-operated switch at a distant point for controllin said magnet arran ed to'open autoinatica lywhen release means actuated by. said ma net for starting the motor, and a centrifugal -actuated switch operativelyconnected to the motor for maintaining the motor-circuit closed independently of the distant control after the -motor has started;

9. In combination, an electric motor, a device controllable from a distance for starting said motor, and an automatic switch controlled ,by the motor speed and controlling the motor having contacts in circuit with said device.

10. In combination, an electric motor, a

device controllable from a distance for starting said motor, and a centrifugally-actuated switch operatively connected to said motor having contacts in circuit with said device.

11. In combination, an electric motor,

- means controllable from a distance for closing the motor-circuit, andmeans controlled by the speed of the motor for closing the motor-circuit through a resistance independently of the distant control.

12. In combination, an electric motor,

means controllable from a distance for closing the motor-circuit, and a centrifugall actuated switch operatively connected to t e motor for closing the motor-circuit through a resistance independently of the distant control. l

13.'.In combination, an electric motor, a device controllable from a distance for closing the motor-circuit, and means controlled :by the speed of the motor for breaking the circuit established by said device and establishing another circuit through the motor.

14. In combination, an e ectric motor, a device controllable from a distance for cl0sing the motor-circuit, and a centrifugall actuated switch operatively connected to t e motor for breaking the circuit established by i said device and establishing another circuit through the motor.

15. In-combination, an electric motor, a device controllable from a distance for closing the motor-circuit, and means controlled by the speed of the motor for breaking the circuit established by said device and estab- -lishing another circuit of higher resistance through the motor.

16. In combination, an electric motor, a device controllable from a distance for closing the motor-circuit, and a centrifugallyactuated switch operatively connected .to the motor for breaking the circuit established by said device and establishing another circuit of higher resistance through the motor.

17. "In a bulkhead-door system, a door, an electric motor for moving said door, an automatic switch controlled by the speed of the motor and controlling the motor -circuit, and a manually-operated switch at the door for controlling the motor independently of the speed-controlled switch.

18. In a bulkhead-door system, a door, an electric motor for moving said door, an automatic switch controlled by the speed-of the motor and controlling the motor-circuit, and a manually-operated motor-controlling switch at the door arranged by its movement from .off position to render the speed-controlled switch inoperative. 19. In a bulkhead-door system, a door, an electric motor for moving the door, means controllable from a distance for controlling the motor-circuit, means controllable by the speed of said motor for closing the motorcircuit independently of the distantcontrol, and a manually-operated switch at the door for controlling the motor independently both of the distant-control and of the speed-controlled means.

20. In a bulkhead-door system, a door, an electric motor for moving the door, means controllable,from a distance for closing the motor-circuit, means controllable by the speed of the motor for closing the motor-circuit independently of the distant control, a manually-operated motor-controlling switch at the door arranged by its movement from ofi position to renderinoperative both the distantcontrol and the speed-controlled when released to off position.

21. In combination with an electric motor, a manually-operated controlling-switchfor starting said motor, and a centrifugally-actuated switch operatively connecte to said motor for breaking the motor-circuit when the motor comes to rest.

22. In combination with an electric motor, a manually-operated controlling-switch for starting said motor, and a centrifugally-actuated switch operatively connected to said motor and controlling said motor conjointly means, and means for returning said switch J with: said manually-operated switch, said a manually-operated switch for starting said I 5 centrifugally-actuated switch being arranged motor, a mechanism driven by said motor to open the motor-circuit upon the stopping of the motor when said manually-operated switch isin one of its positions.

23. In combination with an electric motor,

' a manually-operated switch for starting said .-motor, a mechanism driven by said-motor adapted-to bring the motor to rest at the limit of its travel, and a centrifugally-operated switch operatively connected to said motor for breaking the motor-circuit when the motor comes to rest.

- 24. In combination with an electric motor, I

adapted to bring the motor to rest at the limit of its travel, and a centrifugally-operated switch operatively connected to said motor for breaking the motor-circuit when the motor comes to rest when said manuallyoperated switch is at one of its positions.

In witness whereof I have hereunto set my hand this 17th day of January, 1906.

WILBUR L. MERRILL. Witnesses:

BENJAMIN B. HULL, HELEN ORFonn. 

